RADIATOR GP 4437975 - Caterpillar

Illustration 1 g01349513
(1) Front pump that controls the right-hand side drive motor
(2) Front pump displacement control
(3) Forward solenoid on the front pump (reverse for two-speed SSL only)
(4) Port C
(5) Port B
(6) Port E
(7) Forward solenoid on the rear pump
(8) Rear pump displacement control
(9) Rear pump that controls the left side drive motor
(10) Input shaft
(11) Port A
(12) Port D
(13) Reverse solenoid on the rear pump
(14) Reverse solenoid on the front pump (forward for two-speed SSL only)
Illustration 2 g01349516
(1) Front pump that controls the right-hand side drive motor
(9) Rear pump that controls the left side drive motor
(10) Input shaft
(17) Retraction plate
(18) Displacement control spool
(19) Passage to port B
(20) Passage to port C
(21) Feedback pin
(22) Passage to port D
(23) Passage to port A
(24) Valve plate
(25) Cylinder barrel
(26) Piston
(27) Swashplate The piston pump (hydrostatic system) operates in a closed loop system. The piston pump (hydrostatic system) is a two-section, variable displacement piston pump. The rear section (9) supplies hydraulic oil to the left side drive motor. The front section (1) supplies hydraulic oil to the right side drive motor. The pump is driven from the engine flywheel by a coupling that is splined to the shaft (10).The following main components of the piston pump (hydrostatic system) are located internally: input shaft (10) and Pump displacement control (8) swashplates (27) , pistons (26) , retraction plates (17) , Cylinder barrel (25) and Valve plate (24).Displacement control valves (8) and (2) control the angle